Apparatus for controlling the admission of steam to the auxiliary blast of boiler-furnaces.



G. DB GRAHL. APPARATUS FOR CONTROLLING THE ADMISSION 0F STEAM TO THEAUXILIARY BLAST or BOILER FURNACES.

APPLIOATION FILED JUNE 13. 1912.

Patented Sept. 24, 1912.

2 SHEETS-$112111? 1.

COLUMBIA PLANOOIIAPH cu.. WASHINGTON. ,u. C.

G. DE GRAHL. APPARATUS FOR CONTROLLING THE ADMISSION or STEAM TO THEAUXILIARY BLAST 0F BOILER FURNACES.

APPLIOATION FILED JUNE 13, 1912.

Patented Sept. 24, 1912.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

GUSTAV DE GRAI-IL, OF ZEI-ILENDORF, NEAR BERLIN, GERMANY.

APPARATUS FOR CONTROLLING THE ADMISSION OF STEAM TO THE AUXILIARY BLASTOF BOILER-FURNACES.

To all whom it may concern:

Be it known that I, GUs'rAv on GRAHL, a citizen of the Empire ofGermany, and residing at Zehlendorf, near Berlin, Germany, have inventedcertain new and useful Improvements in Apparatus for Controlling theAdmission of Steam to the Auxiliary Blast of Boiler-Furnaces, of whichthe following is a specification.

My invention relates to those means for regulating the artificial draftof furnaces, particularly of locomotive boilers, in which a closuremember controlling the supply of steam to an auxiliary blast is driveninto its closed position when the engine is started and the main blastis thus produced, but is driven into its open position when steam isshut off from the engine and the main blast is thus stopped.

A primary object of my invention is to provide the auxiliary blastwhich, when the engine is started, is automatically shut off only afterthe action of the main blast has fully developed, is automaticallyoperated only for a definite period after the engine is stopped and issubsequently automatically shut off. One illustrative embodiment of myinvention is represented by way of example as applied to a locomotiveboiler in the accompanying drawing, wherein Figures 1 and 2 arelongitudinal sections showing my apparatus in two different positions ofthe said closure member, F ig. 3 is a horizontal section taken on theline AA in Fig. 1, and Fig. 4 is a side elevation showing a locomotiveprovided with my improved apparatus.

Referring to the drawings, 1 designates the locomotive boiler and 2 thecylinder of the steam engine whose steam chest 3 is connected by thelive steam pipe 4 with the dome 5 and by the exhaust pipe 13 with theblast 14. The shaft 6 of the regulator lever 12 has fast on it a lever11 pivotally connected with the rod 10 which operates the slide valve 9controlling the admission of steam to the pipe 4.

The automatic device, shown in Fig. 4 arranged on the side of the boilerof the locomotive, comprises a valve-box (Fig. 1) in whose cylindricalportion 16 the pistonlike closure member 17 is slidable. This pistonruns out at one end into the piston 18 which is larger in diameter thanthe pis- Specifieation of Letters Patent.

Application filed June 13, 1912.

Patented Sept. 24, 1912.

Serial No. 703,438.

ton 17 and is slidable in the part 19 of the valve-box. The other end ofthe piston runs out into a valve-disk 20 whose seat is at 21. Projectingfrom the valve-disk 20 is another valvelisk 33 whose seat is at 34. Infront of the portion 19 of the valvebox is mounted the portion 7 whichis divided into four chambers 22, 22, 22", 22 by the partitions 8, eachchamber being connected with an adjoining one by a relatively narrowpassage 27, 27, and 27". The chamber 22 is also connected with theinterior of the portion 19 of the valve-box by means of the narrow hole24. Into the chamber 22 opens the duct 2:") which establishes aconnection by way of the non-return valve 26 with the pipe 40 whichopens into the steam pipe 4 connected to the steamchest.

The portion 23 of the valve-box, connected with the portion 16 by way ofthe valve 33, is connected to the steam pipe 48, which again isconnected with the interior of the boiler and, particularly, with thedome 5. The pipe 41 leading from the duct 42 is an air-relief pipe whichpermits the air to escape from the portion 19 of the valvebox when thepiston 18 moves to the right as seen in Fig. 1. The pipe 43 opening intothe portion 16 of the valve-box is connected with the steam nozzles 70in the fire-box. The portion 16 of the valve-box is connected inaddition with a short branch pipe 45 containing the non-return valve 44,and the pipe 46 leading to the auxiliary blast 47 is connected to thisbranch pipe. Inside the piston 17, 18 is a small longitudinal duct 28which is adjustably connected with'the duct 29, so that a connection isestablished between the space in front of the piston 18 and that infront of the piston 17. The connection between the two ducts 28 and 29can be regulated by advancing or withdrawing the screw 30. Further, inthe valve 33 is a duct 32 by which the steam pipe 48 is connected withthe pipe 43 leading to the steamnozzles when the differential piston 18,17 is in its extreme right-hand position.

The above-described device operates as follows WVhen starting the enginethe regulator-lever 12 is turned into its open position, when the slidevalve 9 admits steam to the pipe 4. Consequently, steam is admitted tothe valve-chest and thence to the cylinders. The steam from the pipe 4lead ing to the steam-chest passes into the pipe 40, past the non-returnvalve 26 into the duct 25, through the chambers 22, 22, 22 and 22 andthe hole 24 into the part 19 of the valve-box. As the pressure of thelive steam is thereby reduced, when the engine is start ed the closuremember is not immediately driven into the position shown in Fig. 1, butremains for a short time in the position shown in Fig. 2, when the steampipe 48 is connected by way of the non-return valve 44 with the pipes45, 46 leading to the auxiliary blast. Only after the portion 19 of thevalvebox has gradually filled with steam, and the pressure therein hascorrespondingly increased, is the closure member driven into theposition shown in Fig. 1. lVhen steam is shut off from the engine andthe main blast ceases, the excess pressure in the portion 19 of thevalve-box disappears, and consequently the high steam pressure on thevalve-disk 33 drives the closure member 17, 18 back into the positionshown in Fig. 2, when the steam pipe 48 is connected both wit-h the pipe43 leading to the steam-nozzle and with the pipe 46 leading to theauxiliary blast. The pressure of the steam in the pipe 48, however, istransmitted through the ducts 28, 29 into the portions 19, 7 of theValve-box, and increases here so that after a time the closure member17, 18 is again automatically returned into the position shown in Fig. 1when the pipes leading to the auxiliary blast and to the steam-nozzlesare again losed. A little steam, however, can pass through the duct 32to the nozzles in the fire-box, and is suiiicient to keep these nozzlescool. The non-return valve 26 prevents steam flowing from the portion 7of the valve-box into the pipe 40 leading to the steam-chest. It is tobe understood that the duct 32 also may be provided with a regulatingdevice, so that the amount of steam passing from the portion 23 of thevalvebox into the pipe 43 leading to the nozzles may be suitably varied.

I claim 1. In means for regulating the supply of steam to the auxiliaryblast of locomotive boiler furnaces, the combination of a valveboxhaving a steam admission port at one end thereof connected to theboiler, an auxiliary blast port leading to the auxiliary blast normallyin open relation with the steam-admission port, and a steam port at theother end of the valve-box connected to the steam-chest; a closuremember movable in the valve-box for shutting off the auxiliary blastport from the steam-admission port, the admission port end of theclosure member being smaller than the other end, throttling means in thevalve-box between the steam port and the latter end of the closuremember, the end of the valve-box in front of the smaller end of theclosure member being connected with the end thereof behind the largerend of the closure member.

2. In means for regulating the supply of steam to the auxiliary blast oflocomotive boiler furnaces, the combination of a valvebox having a steamadmission port at one end thereof connected to the boiler, an auxiliaryblast port leading to the auxiliary blast normally in open relation withthe steam-admission port, and a steam port at the other end of thevalve-box connected to the steam-chest; a closure member movable in thevalve-box for shutting off the auxiliary blast port from thesteam-admission port, the admission port end of the closure member beingsmaller than the other end, throttling means in the valve-box betweenthe steam port and the latter end of the closure member, said closuremember having a duct connecting the end of the valve-box in front of thesmaller end with the end thereof behind the larger end of the closuremember.

3. In means for regulating the supply of steam to the auxiliary blast oflocomotive boiler furnaces, the combination of a. valvebox having asteam admission port at one end thereof connected to the boiler, anauxiliary blast port leading to the auxiliary blast normally in openrelation with the steamadmission port, and a steam port at the other endof the valve-box connected to the steam-chest; a closure member movablein the valve-box for shutting off the auxiliary blast port from thesteam-admission port, the admission port end of the closure member beingsmaller than the other end, throttling means in the valve-box betweenthe steam port and the latter end of the closure member, said closuremember having a constricted, narrow duct connecting the end of thevalve-box in front of the smaller end with the end thereof behind thelarger end of the closure member.

4. In means for regulating the supply of steam to the auxiliary blast oflocomotive boiler furnaces, the combination of a valvebox having a steamadmission port at one end thereof connected to the boiler, an auxiliaryblast port leading to the auxiliary blast normally in open relation withthe steam-admission port, and a steam port at the other end of thevalve-box connected to the steam-chest; a closure member movable in thevalve-box for shutting off the auxiliary blast port from thesteam-admission port, the admission port end of the closure member beingsmaller than the other end, throttling means in the valve-box betweenthe steam port and the latter end of the closure member, said closuremember having a longitudinal narrow duct connecting the end of thevalve-box in front of the smaller end with the end thereof behind thelarger end of the closure member, and means for regulating the sectionof said duct.

5. In means for regulating the supply of steam to the auxiliary blastand to the steam nozzles of locomotive boiler furnaces, the combinationof a valve-box having a steam admission port at one end thereofconnected to the boiler, an auxiliary blast port leading to theauxiliary blast normally in open relation with the steam-admission port,a steam port at the other end of the valve-box connected to thesteam-chest, and a steamnozzle port leading to the steam nozzles; aclosure member movable in the valve-box for shutting off the auxiliaryblast port from the steam-admission port, the admission port end of theclosure member being smaller than the other end and having a duct forconnecting the steam-admission port with the steam-nozzle port in theclosed position of the closure member, throttling means in the valve-boxbetween the steam port and the latter end of the closure member, the endof the valve-box in front of the smaller end of the closure member beingconnected with the end thereof behind the larger end of the closuremember.

6. In means for regulating the supply of steam to the auxiliary blast oflocomotive boiler furnaces, the combination of a valvebox having a steamadmission port at one end thereof connected to the boiler, an auxiliaryblast port leading to the auxiliary blast normally in open relation withthe steam-admission port, and a steam port at the other end of thevalve-box connected to the steam-chest; a non-return valve for closingthe latter port, a closure member movable in the valve-box for shuttingoff the auxiliary blast port from the steam-admission port, theadmission port end of the closure member being smaller than the otherend, throttling means in the valve-box between the steam port and thelatter end of the closure member, the end of the valvebox in front ofthe smaller end of the closure member being connected with the endthereof behind the larger end of the closure member.

7. In means for regulating the supply of steam to the auxiliary blast oflocomotive boiler furnaces, the combination of a valvebox having a steamadmission port at one end thereof connected to the boiler, an auxiliaryblast port leading to the auxiliary blast normally in open relation withthe steam-admission port, and a steam port at the other end of thevalve-box connected to the steam-chest; a closure member movable in thevalve-box for shutting off the auxiliary blast port from thesteam-admission port, the admission port end of the closure member beingsmaller than the other end, a plurality of perforated partitions in thevalve-box between the steam port and the latter end of the closuremember, the end of the valve-box in front of the smaller end of theclosure member being connected with the end thereof behind the largerend of the closure member.

In testimony whereof, I afiix my signature in the presence of twowitnesses.

GUSTAV DE GRAI-IL.

Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Iatents, Washington, D. 0.

